ADDITIVES | ANTIMICROBIALS
Figure 2: AATCC 30-III and ASTM G21 test results on untreated PVC and PVC treated with MicroGuard. A score of 0 indicates no fungal growth; 4 shows fungal growth on ≥60% of the surface.
Sample Description PVC Control
PVC with 1 % MicroGuard PVC with 2 % MicroGuard Source: Microban
AATCC 30-III 2 0 0
ASTM G21 4 0 0
tested using AATCC 30-III test method against Aspergillus niger, and ASTM G21 test method against a mixture of five different fungal species [Figure 2]. The treated articles received a score of 0 on both tests, indicating no fungal growth and high antifungal capabilities,” says Jonathan Clapp, International Senior Technical Manager at Microban. “These same tests were repeated after treated
Figure 3: AATCC 30-III and ASTM G21 test results on untreated and MicroGuard-treated PVC after 7 and 14 days of UV exposure. A score of 0 indicates no fungal growth; 3 shows fungal growth on 30-60% of the surface
7 days
Sample Description PVC Untreated
PVC with 0.6% MicroGuard PVC with 0.8% MicroGuard Source: Microban
UV exposure ASTM G21
3 0 0
14 days
UV exposure ASTM G21
3 0 0
OBPA alternative The latest addition to Microban’s product line is MicroGuard, a portfolio of antifungal additives for PVC, PU, and EVA applications, including outdoor PVC products (roof membranes, awnings, decking) and PU and EVA foams (shoe soles, mattresses, furniture cushions). The additive, which uses a combination of two organic active ingredients, was developed as a non-leaching alternative to OBPA and is available in pellet and liquid formulations. “MicroGuard’s more favourable toxicity profile is
ahead of the curve in terms of shifts in the regula- tory landscape concerning built-in antifungals for these goods, offering manufacturers a highly effective built-in solution to increase product durability,” says Michael Ruby, President of Micro- ban International. “The performance of MicroGuard on PVC was
and untreated PVC plaques were exposed to UV light (340 nm) for 7 and 14 days, to determine whether the technology is appropriate for use in outdoor settings with high UV exposure [Figure 3]. PVC plaques treated with 0.6% and 0.8% Micro- Guard received a score of 0, indicating no fungal growth, and demonstrating that UV exposure did not impact antifungal capabilities,” Clapp says. “Recycled plastics often carry carbon-based contaminants that support microbial growth. The addition of an antimicrobial will prevent microor- ganisms from using those contaminants as a food source. Antimicrobial additives can be integrated into the recycling stream during pelletising or added into the moulding process during the plasticising stage. After adding the antimicrobial into the recycled plastic, manufacturers can expect decreased staining and odours caused by micro- bial attack, as well as preservation of mechanical properties,” he explains.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.wellsplastics.com �
www.sanitized.com �
www.heiq.com �
www.techmerpm.com �
www.polygiene.com �
www.addmaster.co.uk �
www.mocom.eu/en �
www.tolsa.com �
www.parxmaterials.com �
www.gelest.com �
www.microban.com
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